What's The Best Way To Create These Objects And Match Them To Another Object (References Inside)
There probably  isn't a best way, but sometimes it's easier to start this kind of thing in the flat, to keep things simple early on.

Using that approach, with Pivot set to 'Active Element', Vertex Mode, starting with a plane. and the right vertex active. Numpad7 Looking orthographically down Z


ShiftDRZ rotate a copy of the plane out to the desired angle.
K with C and Z cut through with a constraint to the vertical
Face Mode, X delete the unwanted triangle
E extrude all the remaining faces
Edge Mode, all selected, CtrlB bevel the edges